What is the two-digit number? i. the difference between the two digits is 9. ii. the sum of the digits is equal to the difference between the two digits. a. i alone sufficient while ii alone not sufficient to answer b. ii alone sufficient while i alone not sufficient to answer c. either i or ii alone sufficient to answer d. both i and ii are not sufficient to answer e. both i and ii are necessary to answer?
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option e. is correct
this is because to equations are necessary for finding digits.
this is because to equations are necessary for finding digits.
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e) both i and ii are necessary to answer.
Consider the tens and units digits to be x,y respectively
Acc to ques, x+y=x-y
So , either x=0 or y=0
Since we want two digit number : x cannot be 0
So , y=0 and x can take any value from 1 to 9
So , we get numbers 10,20,30,40,50,60,70, 80 and 90 Now , since only 90 fulfills the condition x-y = 9
Hence , no :- 90
Consider the tens and units digits to be x,y respectively
Acc to ques, x+y=x-y
So , either x=0 or y=0
Since we want two digit number : x cannot be 0
So , y=0 and x can take any value from 1 to 9
So , we get numbers 10,20,30,40,50,60,70, 80 and 90 Now , since only 90 fulfills the condition x-y = 9
Hence , no :- 90
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